import type { Graph } from "../../graph";
import type { Layer } from "../../services/Layer";
/**
 * Hook for managing graph layers.
 *
 * Provides a convenient way to add and manage layers in the graph.
 * Automatically handles layer initialization and props updates.
 * Uses deep props comparison to optimize re-renders.
 *
 * @example
 * ```tsx
 * const devToolsLayer = useLayer(graph, DevToolsLayer, {
 *   showRuler: true,
 *   rulerSize: 20,
 * });
 * ```
 *
 * @template T - Type of layer constructor extending Layer
 * @param graph - Graph instance
 * @param layerCtor - Layer class constructor
 * @param props - Layer properties (excluding internal props like root, camera, graph, emitter)
 * @returns Layer instance or null if graph is not initialized
 */
export declare function useLayer<T extends Constructor<Layer> = Constructor<Layer>>(graph: Graph | null, layerCtor: T, props: T extends Constructor<Layer<infer Props>> ? Omit<Props, "root" | "camera" | "graph" | "emitter"> & {
    root?: Props["root"];
} : never): InstanceType<T>;